Although this was the first feature film with a Vitaphone soundtrack (therefore being the first film with a completely synchronized soundtrack), it is by no means the first sound film. The first sound film can be dated back to 1895; the process was re-discovered and improved by a French company (using a gramophone) in 1910. In 1913 Thomas A. Edison announced that all the problems of sound films were solved, and showed what he called "the first sound film." As in the earlier efforts, Nursery Favorites had a gramophone that appeared to synchronize with the film. There was one problem: the film was projected at the wrong speed, and the soundtrack was slowed down inadvertently. This problem happened all too often, and a frustrated Edison abandoned his process. In 1921 D.W. Griffith employed various experts to film a sound introduction for his film Dream Street, which still exists, and the performance went off without a hitch. Griffith soon stopped using sound because he thought it was financial suicide, stating "Only 5% of the world speaks English, so why should I lose 95% of my audience?" However, by 1925 sound had arrived in the form of radio, and it was inevitable that film would follow.
At the film's premiere, Will Hays, the then "Czar" and censor of the industry, contributed an on-screen introduction, talking in synchronized sound, greeting everyone in the audience with "Welcome to a new era of motion picture." After that, the Los Angeles Philharmonic was filmed playing "Tannhäuser", violinists Mischa Elman and Efrem Zimbalist Sr., guitarist Roy Smeck, three opera shorts with Giovanni Martinelli Marion Talley and Anna Case, and then the feature. It was a huge success.
Don Juan plants 191 kisses on various females during the course of the film, an average of one every 53 seconds.
In the opening credits are "Inspired by the legend of the Greatest Lover of all Ages" and "A Warner Brothers Classic of the Screen".